The Dan D’Agostino Relentless Preamplifier is an unparalleled statement in high-end audio, engineered as a three-chassis masterpiece for ultimate performance. Dedicated enclosures for left and right audio channels flank a central power supply and control unit, ensuring absolute isolation and eliminating interference. Its fully balanced, discrete, direct-coupled signal path operates with zero global negative feedback, revealing astonishing detail and a frequency response flat to 120 kHz.

A key innovation is its incredibly precise volume control, utilizing discrete components to maintain pristine signal integrity at any level. The massive power supply, featuring dual toroidal transformers and extensive filtering, provides an incredibly clean and stable foundation. With five balanced XLR inputs and multi-zone output capability, it offers immense versatility. An optional Digital Streaming Module further extends its capabilities, adding high-resolution digital inputs and integrated streaming services. Housed in a meticulously machined aluminum and copper chassis, the Relentless Preamplifier delivers a musical experience of breathtaking realism, dynamic prowess, and expansive dimensionality.

Power Supply
Positioned between the two audio channels, the power supply makes use of extensive electrical and magnetic shielding to keep radiated interference out of critical preamplifier circuits. Internal line conditioning circuitry filters RF noise on the AC power and compensates for asymmetric power waveforms and DC on the mains. Power for the preamplifier stages comes from two 150 VA toroidal transformers – one dedicated to the analog circuitry and one for the digital and control circuitry. These transformers drive an 8-amp bridge rectifier and 26,400 microfarads of filter capacitance. The two regulators for the analog stages are scaled-down versions of those used in the Relentless Mono amplifier. The separate digital regulator is a monolithic platform with thermal and current limiting protection in the unlikely event of a fault. The Relentless Preamplifier has nearly as much power supply capability as many power amplifiers.

Room to Breathe
The input stage in each mono preamplifier is the result of a design experiment for a circuit that hadn’t been used in any previous D’Agostino preamplifier. As part of development, a version was tested in the existing Momentum Preamplifier. The overwhelmingly positive results led directly to the launch of the Momentum HD Preamplifier. From there, the fullest expression of this idea was developed, and the Relentless Preamplifier was underway.

The audio circuit topology starts with a new discrete differential FET input stage featuring a voltage input signal capability of an extraordinary 30 volts. With an input impedance of over 1 MOhm, the Relentless Preamplifier’s front end is immune to source related electrical issues. In normal operation, component heating can lead to performance and sonic degradation. Developed specifically for the Relentless Preamplifier, a unique circuit maintains a stable bias so that temperature related anomalies are offset thus preserving performance during extended listening.

Featuring only balanced XLR inputs the Relentless Preamplifier topology rejects common-mode input noise over an unusually wide bandwidth. All signal gain is realized in the current domain using proprietary multiple-output current mirrors with nearly 30 times the linearity of other designs. Executed with four-layer circuit boards for superior signal quality. The use of four-layer boards dramatically reduces distortion and propagation levels as compared to the more commonplace, two layer boards.

The analog and digital circuit elements are isolated, including ground planes, from each other. Where necessary, digital control signals are optically coupled to analog circuits. The signal switching relays are hermetically sealed and use gold-plated contacts for maximum signal integrity.

Utilizing no negative feedback anywhere, core D’Agostino circuit concepts include a signal path that is fully complementary and balanced from input to output achieving a frequency response flat to 120 kHz.. The overall result is a musically dense and dynamically rich signal presented to the balanced outputs.

Separate but Linked
Arguably, the most striking element of the Relentless Preamplifier is the pair of volume controls fronting the two audio chassis. Volume control circuits are often overlooked, if not actively minimized, in preamplifier designs. This is not the case in the Relentless Preamplifier. Each volume control is constructed using 14 separate metal components ensuring the smoothest response and control of the military-grade, high-linearity solid-state switches and discrete precision resistors employed in the volume circuit. The bandwidth and transient response of the Relentless Preamplifier is completely unaffected by the volume setting. As a result, high frequencies sound especially smooth and extended, and music emerges from “jet black” silence.

The volume settings are displayed via the elegant swiss watch inspired volume wands or can be displayed numerically, from 0 to 99.

Two Preamplifiers in One
The Relentless Preamplifier is a two source/two zone preamplifier. This means that the Relentless Preamplifier can simultaneously control the switching and volume of two sources in two separate rooms or zones. Listening sources may be two analog sources or when equipped with the optional digital streaming module, one digital source and one analog source. In a one zone system, either volume control will adjust volume in the main room or Zone 1. If two zone operation is desired, the upper volume control manages the Zone 1 volume and the lower volume control adjusts the Zone 2 volume.

Preamplifier status in your hand
Housed in machined aluminum and copper, the Relentless Preamplifier remote control is a comfortable design operated via touch pad. Control buttons are minimized with most of the operation executed by navigating via a tactile touch pad. Bluetooth 5.0 technology extends the usable range of the remote control and eliminates the line-of-sight issues that plague conventional infrared designs. New for the Relentless Preamplifier is bi-directional remote-control functionality. All adjustments made on the Relentless Preamplifier front panel are reflected on the remote control’s display screen including input, volume, and balance selections.

Frequency Response: 0.1 Hz to 120 kHz, +/- 0.0 dB
Signal-to-Noise Ratio: -105 dB, unweighted / -100 dB, weighted
Gain: + 8/+14dB selectable
Finish: Silver or Black with Custom Finishes Available Upon Request
Total Harmonic Distortion: <.006%, 20Hz to 20kHz
Inputs: 5 pr - Balanced via XLR connectors
Outputs: 2 pr Balanced via XLR connector for Zone 1, 1 pr Balanced via XLR
Dimensions: 17 x 1.75 x 17 in / 43.2 x 34.9 x 43.2 cm
Weight:132 lb / 60 kg
Dimensions(Preamp): 17x 3.9 x 17 in / 43.2 x 9.9 x 43.2 cm
Dimensions(Power Supply/Base): 17 x 3.9 x 17 in / 43.2 x 9.9 x 43.2 cm
Analog Inputs: 5 stereo pairs of balanced XLR
Digital Inputs (w/DAC Module Installed): 1 USB A type, 1 Optical, 1 SPDIF, 1 coaxial, Ethernet RJ45, 1 WiFI
Control: RS-232

Orders ship Sunday through Friday from our offices in Dubai, UAE.

In-stock products typically ship within 48 hours and should be expected to arrive in 3-4 business days. Orders outside of the UAE should be expected to arrive in 5-7 business days.

Pre-order and backorder products will state the approximate delivery timeline beside the Add To Cart button.

If you would like to place a custom order, chat with our specialists for a guided shopping experience. Once your order has been placed, a timeline will be provided depending on your order details.

- Free delivery within the UAE
- Shipping charges will be calculated upon checkout for orders outside of the UAE (Bahrain, Oman, Kuwait, Saudi Arabia & Qatar).
- Taxes and duties are calculated according to the applicable laws of the state or country an item is shipped to and are the customer's responsibility.

For additional information on shipping and our exchange & return policy visit our help center.

Installation charges are applicable and can be paid upon delivery for our clients based in Dubai.

- Installation Charges: AED 450 Per Hour
- Speaker Cables: AED 32 Per Meter
- Trunking: AED 10 Per Meter

For clients based outside of the UAE, please contact our specialists and we will share an estimate based on your requirements.